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Geologic time Noun

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[jee-oh-loj-ik tahym]

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Fossil Noun

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[fos-uhl]

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Body fossil Noun

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[bod-ee fos-uhl]

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Trace fossil Noun

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[treys fos-uhl]

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Sedimentary rock Noun

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[sed-uh-men-tuh-ree rok]

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Relative dating Noun

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[rel-uh-tiv dey-ting]

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Principle of Superposition Noun

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[prin-suh-puhl of soo-per-puh-zish-uhn]

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Absolute dating Noun

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[ab-suh-loot dey-ting]

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Isotope Noun

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[ahy-suh-tohp]

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Radioactive decay Noun

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[rey-dee-oh-ak-tiv dih-key]

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